Tweetbot 3 - if you use twitter a lot, this app is for you. Well of course there are other apps but in most cases if you try this one , you'll probably not change your mind.
Pocket - I love this app. Can't imagine my phone without it.
iTV Shows 3 - highly recommended for someone who likes to keep track of his favorite tv shows. Great iOS 7 experience.
bwin Sports - not for everyone if you know what i mean